Adding any script of any length, not to mention adding images, will both slow page load times. You can minimize this by optimizing the images and the script. However, the script (jquery.min.js) is already optimized for the most part and the other script code is so short as to make no real difference. You may be able to realize some speed gains by hosting the jquery.min.js script on your server.
Layout (particularly the use of nested tables) can really slow things down if there are other items within those tables (like images or scripts) which require their own loading time.
So, optimize your images and your layout. Other than that - tell these people to get a faster internet connection. 
If you want more help:
Please post a link to the page on your site that contains the problematic code so we can check it out.
Bookmarks